Method of making sound-records.



' .N 374,966. v PATENTED DEC. 31, 1907 I. KITSEE; I METHOD OF MAKING SOUND RECORDS.

APPLIUATION FILED JUNE 7, 1907;

WITNESSES [NJ/EN TOR.

ISIDOR KITSEE, OF PHILADELPHIA, PENNSYLVANIA.

METHOD OF MAKING SOUND-RECORDS.

Specification of Letters Patent.

Patented Dec. 81, 1907.

Application filed June 7.1907. Serial No- 377,753.

To all whom it may concern? Be it known that I, ISIDOR Krrsnn, citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Penns lvania, have invented certain new and usefiil Improvements in Methods of Making Sound-Records, of which the follow ing is a specification.

My invention relates to an improvement in method of making sound records. Its object is, to produce copies of master records in an eflicient and economical manner.

The underlying principle of my invention resides in, first, producing the master rec 0rd second, producing a reverse therefrom; and, using both of these records, one as a male, the other as a female, to produce copies by compressing a suitable material be tween the two records.

It is also one of the features of my invention to enlarge the recording lines on the master record, as will hereinafter be more fully described.

In the drawing, Figures 1, 2, 3 and 4 are perspective views of records.

1 is the master record; 2 the recording lines therefor; 3 the reverse with the record-v ing lines 4; 6 the master record with the enlarged recording lines 5; and 7 is the copy with the recording lines 8. i

The mode of operation is as follows: I, first, produce the original or master record of the disk type, in which the undulations of .the line represent the undulations or vibrations of the diaphragm. I then. produce a reverse of this original record by suitable means, such for instance as an electro-plat ing process. Both of these records can then be used, one as a male, the other as a female, and suitable material, such for instance as thin metal, placed between them, and. the record produced on this metalby the process of stamping or compressing both of the records together, a process which is well understood and does not need further de- 'scripti'on. But, as the reverse will have the same proportion as the original record, it is,- in most cases,requir'ed that the lines of the original record'should be broadened and especiallyv should be: deepened. For this reason, after the reverse is made therefrom,

I subject the .master record to an etching process, first, providing the surface with a material opaque to the etching fluid. This to produce copies.

process deepens the grooves or lines and broadensthe same to a certain extent.

Different materials may be used for the copies, but I have found that aluminium answers the purpose best, for the reason that it is light, ductile, and yet presents a certain strength, even if made in very fine sheets.

, It is obvious, that the master record has to be cleaned from the etching fluid, as well as the etch-resisting material on the surface, and the reverse record has to be provided with suitable backing before being employed, It is also obvious, that care should be taken in meshing the original with the reverse, and for that reason, it is preferred that both of them should have either perforations, or, one a deep depres sion and the other a raised portion in alinement. For this reason, I have provided the original with a center hole and the raised portion 9, and the reverse has, therefore, the center hole and the depressed portion 10.

Having now described my invention,

what I claim as new and desire to secure by -.a reverse therefrom, enlarging the lines of the master record, and producing copies by compressing a material betweenthe master record and its reverse.

2. The method of producing copies of phonographic records, which consists in, first, producing a master record; in, second, taking an electro-plating reverse from said master record; third, deepening the recording lines of the master record and, fourth, compressing suitable material between the two records.

' 3. The process of producing a copy of a masterrecord, which. consists .in, first, producing a master record and taking a reverse of said record, then. enlarging the lines on said master record, and then subjecting .a 100 suitable metal to pressure between the master record and its reverse.

, In witness whereof I affix my signature in presence of two witnesses.

ISIDOR KITSEE.

Witnesses:

' MARY 0. SMITH, H. C. Yn'rrnn. 

